Machine for making paper box blanks



Nov. 26, 1935. c. EISENLOHR ET AL 2,02 ,37

MACHINE FOR MAKING PAPER BOX BLANKS Filed Oct. 19, 1954" GSheets-Sheet 1ATTORNEY NOV. 26, c E|SENLQHR ET AL MACHINE FOR MAKING PAPER BOX BLANKSFiled Oct. 19, 1954 e Sheets-Sheet 2 INVENTORS' L7'oseph fiern,deceased, 1 08 1 Barbara flerrv, Executmx,

ATTORNEY Nov. 26, 1935. c. EISENLOHR ET AL MACHINE FOR MAKING PAPER BOXBLANKS Filed Oct. 19, 1934 6 Sheets-Sheet 3 1566 1 seo Execu fmx,

ATTORNEY.

Nov. 26, 1935. c. EISENLOHR El AL MACHINE FOR MAKING PAPER BOX BLANKSFiled Oct. 19, 1954 6 Sheets-Sl 1eet 4 RJQ .r H v e r 4/ wmfi a fenm HMfl www r L mm 105 0 r w w Nov; 26, 1935. c. EISENLOHR ET AL I MACHINEFOR MAKING PAPER BOX BLANKS Filed on. 19, 1954 6 Sheets-Sheet 6 Jse l1da rba ia fier Patented Nov. 26, 1935 UNITED V STATES PATENT OFFICEMACHINE FOR MAKING PAPER BOX BLANKS Application October 19, 1934, SerialNo. 749,050 15 Claims. (01. 93-55) The principal object of our presentinvention resides in the provision of improvements in the constructionof a machine for making paper box blanks, disclosed in a patent issuedto us Novemher 3, 1925, No. 1,560,162.

A further object being to provide heavy cross bracing means for a frameand to confine the mechanism, which in the operation of the machine, issubjected to heavy strains and stresses, including an improvedindividual springing construction, between or within the heavy .crossbracing means and the interlocked sides of the frame in the upperportion thereof.

A further object is to provide adjustable conveying belts or tapes inconnection with novel adjustable glue applying mechanisms.

Further objects include automatically controlled gravity stops forregistering the box blanks just prior to a sealing operation, and safetymeans for preventing breakage of parts in the sealing operations, if thetiming should be disturbed or for other reasons.

A further object has been effectively accomplished by inverting theimportant mechanisms of the above identified patent to eliminate gluedrippings, and deposits forming on the active parts, making it necessaryto suspend production, for cleaning the parts at frequent intervals.

A further important feature is to dispose individual springingmechanisms at opposite sides of the machine at the sealing station andin direct line with the pressure or sealing thrust, to insure perfectsealed joints between the side and. center of the box blanks as thisconstruction compensates for all inequalities of box blank material andthe quality of the glue employed; and further the alignment mentionedprevents side or lateral strains or stresses.

In order that the invention may be clearly understood, and readilycarried into effect, the same will now be described more in detail withreference to the accompanying drawings illustrating a preferredembodiment thereof and in which:

Fig. 1 is a vie-w of the right side of the box blank making machine,with parts broken away, parts in section and parts omitted, and showingthe locations of the driven shafts of the machine.

Fig. 2 is a view of the left side of the machine showing a clutchcontrol means and with parts omitted.

Fig. 3 is a rear elevation of the machine with parts broken away andparts omitted, showing a set of paper box blanks in position ready forthe sealing operation.

Fig. 4 is a p or p an v ew of b x f eding and conveying mechanism withparts of the machine omitted.

Fig. 5 is an enlarged sectional elevation taken about on the dotted line5-5 of Fig. 3, showing the automatically controlled stops carried on a 5cam controlled drop-bar on the outside of a spring casing.

Fig. 6 is an enlarged section taken along a pulley shaft and about onthe dotted line 6--6 of Fig. 4.

Fig. 7 is a vertical sectional elevation through a glue box at about onthe dotted line 1-1 of Fig. 6, showing an eccentrically mounted bearingwhereby a revoluble shaft may be adjusted laterally.

Fig. 8 is an enlarged view of the spring casing shown in Fig. 5, butlooking from near the center of the machine as indicated by the dottedline 8-8 of Fig. 3, parts being broken away to di's-' close the springsand their supports, the stops being omitted.

Fig. 9 is a fragmentary vertical section on the line 9-9 of Fig. 8, aportion of a presser and its guide casing added.

Fig. 10 is an enlarged section taken about on the line l0-|0 of Fig. 4,showing the manner of mounting a pair of rear pulleys on a revolublesleeve common to both and the means employed for adjusting the outer ofthe pulleys along the sleeve for conveying side box blanks of varieddimensions.

Fig. 11 is a side elevation of said outer pulley and its support.

Fig. 12 is a detail side view of an anvil plate having integral springrests disposed centrally of said plate so that sealing thrusts arereceived centrally of heavy springs to eliminate side or lateral strainsor stresses.

Fig. 13 is an end view of the anvil plate.

Fig. 14 is a top or plan view of a composite paper box blank formed. bythe machine 'of our invention, showing the inner edges of the sidepieces overlapping the side edges of the center piece.

The machine may be described in detail as follows: 2|] indicates themain side frames, the bottom parts of which are extended to formsubstantial floor engaging surfaces and the upper portions of whichextend upwardly to form parallel side portions 2|, and a connecting toppor- 5 tion 22, preferably integral with the side portions for strengthand stability.

Bolted or otherwise rigidly secured to the underside of the connectingtop portions of the main frames, is a heavy channel or box beam 23,

for effectively tying the upper portions of the frames together againststrains and stresses in the operation of the machine parts, and furtherfor supportingparts of the oppositely arranged anvil mechanisms.

Projecting from the box beam 23 is an arm 23 to which are secured theplates 23* (Fig. 1) which form the real walls of the blank sheetmagazines.

Suitably secured to the front of the upper frame portions 2! are a pairof brackets 2-1.

A pair of cross supporting bars 25 are secured to the brackets at thefront and rear thereof and support a plurality of rails 25 to form asupporting surface for the main or central sheets 'A of the sets of boxblanks forming parts of a box blank structure when assembled by thismachine.

Slidably mounted on the bars 25 are a pair of plates 21, having nuts 25,secured to the under faces for engaging two of a number of adjustingscrews 29 of the machine, all being connected for simultaneousadjustment by a hand operated chain 35.

Extending upwardly from and secured to each of the plates 21, a shortdistance outwardly from its inner edge, is a dividing plate 30 whichdefines the sides of the central sheet magazine, the central sheets Aresting on the inner edges of the plates 2'! and the sheet supportingrails 26.

Adjustably mounted on each plate 2'! as by means of the brackets 3|,having slots 32 therein are side plates which constitute the outer wallsof side magazines for wing or side blanks B of the box blank to beformed, a wing nut 34 or other device being provided to secure the sideplates in adjusted positions. Each plate is formed with a slot oropening 35 for permitting free operation of sheet feeding devices 36,here shown as toothed blocks 3? swingable on a drag rod 38 and eachhaving a weight 39 for holding the teeth of the blocks in contact withthe respective bottom sheets of the blank stacks in the magazines duringthe feeding stroke or operation of said blanks to suitable feed rollshereinafter described.

The drag rod 38 passes through slots 36 in the brackets 24, and itsextended ends have pivotal connections with links ii, which in turn areconnected at their opposite ends with wrist pins 42 carried by crankdisks 43 on a constantly driven cam shaft i 'l properly timed with othermechanisms of the machine, to be later described. It will be obviousthat through thelinks ii, at each revolution of the cam shaft a set ofbox blanks are fed from the magazines into engagement with and betweenvertically aligned feed rollers and 26 respectively; the upper rollerG5, having'an extended shaft th which is journalled in bearings fixed tothe sides 2i of the frame 25, while the lower roller or rollers 46 haveadjusted contact with the upper roller through yielding mountings as at@8 made adjustable by set screws 49 and springs 59, as shown best inFig. 1 of the drawings.

The driving mechanism consists of a motor 5!, or other source of power,having a sprocket 52 connected through a chain or belt 53 to a suitablyproportioned gear 55, fast on the cross shaft 55, which shaft at itsopposite end, carries a pinion 55, meshed with a large gear 5'5, looseon an end of a presser shaft 58. The cam shaft 44 and the presser shaft58 are driven in synchronous timed relation by a sprocket gear 59 formedon one of the crank disks and a sprocket gear fill on the presser shaft53 through a chain connection 5| as shown in Figs. 2 and 3 of thedrawings.

The driving mechanism is continued through a sprocket 62 (Fig. 3) on thecross shaft 55 over which a chain or belt 53, is carried to a sprocket 5on an ejector shaft 65, and thence over a sprocket 55 (Fig. i) on thefeed roller shaft w thus providing a three point drive.

Secured to the ejector shaft 65, centrally of the machine, is an ejectorroller 57 which has a central fixed position on its rotary shaft, itsrotating edge being above and clear of the central piece of thecomposite box blank when at the sealing station and ccacting with theejector roller for ejecting a finished box blank from the machine is acompanion roller 58 (Fig. 1) carried at the free end of an arm fast on arock shaft 75, with another arm '5? having a roller 12, adapted tocontact a cam ii on the presser shaft 53, for raising said roller 58 attimed intervals, to engage the underside of progressive central boxblanks at a point opposite the upper roller 5?, to effect an opposedqueeze against said blanks.

An important feature of the present invention is found in novelconveying means for the box blanks from the feed rollers to the sealingstaticn, said means presenting an adjustable structure for varyingwidths of center and side blanks which will now described with referenceto Figs. 1, and 6 of the drawings.

Bolted or otherwise rigidly secured to the side '1:

frames 2 5, about midway the height of the frame is a lower box beam M,on which a pair of presser housings '55, may adjustably spaced by thescrew shaft 25; these housings have end extensions '28 (Fig. i) andpassing through the extensions at the front ends of the housings is apulley shaft 71 for supporting a. number of pull ys, which may best bedescribed in pairs, i. e., a pair of center pulleys it operating alongthe inner faces of the presser housings i5, and opposite pairs of sidepulleys l5 operating outward of the presser housings; at the opposite orrear ends of the presser housings ?5 are mounted for rotation, acorresponding pair of center pulleys '53,

and corresponding pairs of si"e pulleys 19 seen best in Figs. 4 and 1.

The pulleys just described all have circumferential grooves 85,preferably having inwardly flaring walls 8! and a fiat bottom 82, (Figs.6

and 10), in which conveying belts or tapes having a similarcross-sectional contour are received; the belts are preferably flexiblebut not elastic and are maintained taut or tight between theirrespective pulleys and are preferably but not necessarily of arubberized material to create a corn veying or tractive contact with thebox blanks resting thereon.

It will, of course, be understood that the pair of center belts 8-3, actto convey the center box blanks A to the presser station while the sidebelts 3 act to convey the side blanks B to said station. The crosssection shape of the pulley grooves and belts produces an interlocking,gripping or wedging action, so that there is no slippage or creeping ofthe belts on the pulleys in operation.

"Vieans for quickly adjusting the spacing of the side belts 8:3 toaccommodate different widths in side blanks, may accomplished byconstruction shown best in Figs. 4 and 6, which may be described asfollows:

The pulley shaft ll is preferably driven from the shaft 45 of the feedroller d5, through an appropriate connection such as a belt or chain orby gears located either within the side frames 2I,or outside the same asshown at 85 in Fig. 4.

The pulley shaft 1! is formed with a longitudinal groove or keyway 85,in which elongated keys 85 (only one shown) rest, these keys are wideenough to pass through slots 81 in inner tubes or sleeves 83 and intogrooves 89, formed in a portion of outer sleeves, tubes or handle pieces99, forinterlocking the parts TI, 88 and 90 for simultaneous rotation.

Each of the inner sleeves 88 has a row of V shape ratchet teeth 9| cuttherein, which are engaged by toothed ratchets 92 having tubular shanks93 having radial movements in sockets or bores 94 formed in the outersleeve, Fig 6. Charged springs 95 housed within the tubular shanks 93 ofthe ratehets, serve to exert a yielding thrust of the tooth ratchets 92into setting contact with the ratchet teeth 9| of the sleeves 88 whichoperate to yieldingly lock the outer of each pair of side pulleys I9 inan adjusted spaced position relative to the position of the inner ofsaid side pulleys 79, to compensate for various widths of side blanks Bof the box blank structure. For convenience in making this adjustment,the outer sleeves 90 serve as handles which may be gripped by the handto draw the ratchets against the resistance set up by the spring urgedratchets, longitudinally along the pulley shaft IT to a determinedposition for conveying the side blanks B of a known width or dimension.

The inner pulley 19 of each pair of outer pulleys is fast with itsrespective inner sleeve 88, as are also glue applying rollers 96, havingbeveled fender hubs 91 bearing against the presser housing extensionsIt, to exclude excess glue from the abutting faces of the hub andbearing, as clearly shown in Fig. 6. The center pulleys I8, fixed to theinner sleeve 88, inwardly of the bearing extensions I6 of the presserhousing, are formed with tubular hubs 98, to which gears 99 are fast,which gears are in constant mesh with driven gears I09 fixed to shaftsIllI extending through bearings I92 and into bearings I O3 in theopposite side walls of the glue boxes I04, Figs. 6 and '7. a

Fixed on the revoluble shafts IUI are 'glu feeding rollers or disks I95, having formed in their peripheries circumferential grooves I06, of arectangular cross section, whose side walls I01 move in near contactwith the peripheral sides of the glue applying rollers 95, which areformed with a smooth flat circumferential face I08 for applying auniform sharply defined line of glue to the under surface of the passingside box blanks B and near the inner edges thereof.

The glue boxes IE4 have hoods or extensions H39 through which the lowerportions of the glue applying rollers sweep in their rotary move: ment,leaving a narrow space as at H9 between them and the bottoms of thegrooves I06, thus picking up at that point films of glue correspondingto said space.

Wipers or brushes II I are preferably arranged .within the hoods and atthe sides of the feed rolls I05 to sweep back excess glue clinging tothe side faces of both feed and applying rollers, as clearly shown inFig. 6 of the drawings.

The bearings I92 and I93 are bored eccentrically in opposite circularsupporting blocks II2, held by retainer rings H3, to set positions andmaybe adjusted for changing the space III'I between the glue feeding andapplying roller-s by retracting holding bolts H4 and then rotating saidblocks in circular concentric openings H5,

I I6, carrying revoluble sleeves I H, to which both of the side pair ofpulleys 19* are made fast, the inner of each pair being made fast by adriving fit, and the outer pulleys of these pairs by cross or clampingbolts II8 connecting split portions thereof as shown in Figs. 10 and 11.The bolts I I8 may be eased up and the outer pulleys moved along thesleeves I H to a determined point, then the bolts set up again.

A hand wheel H9 is made fast to the cross shaft 55 for turning the partsfor inspection and timing when the power driving means is shut off.

The presser housings (Figs. 1, 3 and 4) are provided with side guidesI29, in which pressers or presser plates I2I are vertically movable byelongated cams or eccentric portions I22 on the presser shaft 58; thesecams carry sleeves I23 within which they rotate and the said sleeves areconfined against longitudinal movement between rigid bearings I23 boltedto the floor of the lower box beam I4.

The sleeves have 'flat upper surfaces assembled with anti-frictionbearings I24, held against the top faces I25 of rectangular openings I26formed in the pressers 2I, by the side legs of yokes I2'I secured bybolts I28, (Fig. 1) and in the pressing or sealing operation therotation of the cams move.

the sleeves laterally within the yokes under the anti-friction bearingsI24, this presser action being similar to that shown and described inthe patent above identified except that the pressing movements areupward in this case instead of downward in the patent, for reasonshereinbefore set forth.

The automatic stop mechanism shown, described and claimed in theaforesaid patent is retained in this application for the purpose ofpresenting a complete machine, and will only be generally described asfollows:

Means are provided for preventing the operation of the sealing parts incase no feed is made from any magazine, said means comprising ashouldered lever I29 for each magazine, pivotally mounted on curved armsI 39 (Figs. 1 and 2); a forwardly directed feeler or finger I3I isextended from each lever I29 and is curved over and down in front of thetop feed roller into the path of movement of the sheets from eachmagazine; a torsional spring I32, coiled around the pivot of andengaging each lever I29 serves to hold it against the free end of an armI33 secured to a shaft I34 which isoscillated by an arm I35 connected bya link I36 to an arm I31 pivoted to a gear case I38 as at I39. The armI31 carries a roller hi9 which rides over the cam I35 on a clutch I44and a curved link It! connects said arm l3! with a clutch actuating dogI42, pivoted at I43, on an end of dog controlling handle lever I45. Thedog I42 is operated through the above de scribed connections to stop thepressing mechanism when the blanks are exhausted from one or more of themagazines by disconnecting the constantly rotating gear 51, from thepresser shaft 58 by releasing a clutch pin I46 (indicated in Figs. 2 and3) in a manner described in said Patent No. 1,560,162.

In Fig. 1 is shown a roller I41 directly above the pulley shaft 11 forurging the passing side box blanks into intimate contact with the glueapplying rollers 96.

The blank supporting faces of the side belts 84 are raised above thecorresponding faces of the center belts near the front of the conveyorsystem, by outwardly projecting rollers or pins I48, (Figs. 1 and 4) andsaid outer belts are maintained at such elevation by the positions ofthe rear side pulleys 19 (see Fig. 1).

Important features of our invention are found in the individualspringing mechanism and associated parts which will now be described:

Mounted in vertical alignment with the pressers I2 I, are a pair ofanvils or anvil plates I49, (Figs. 8, 9, l2 and 13) formed withprojecting base flanges I 58, end guide extensions I5I spring seats I52,and elongated slots I53, through which movement limiting bolts I54 arepassed.

The anvils I49 are slidable between inner plates I55, (Fig. 8) and outerplates I56 (Fig. 5) the latter having semi-circular depression I51,forming half housings for heavy springs I58, the other half of thespring housings being formed by cupped cover plates I59 bolted overopenings in the inner plate I55 (Fig. 8).

Operating in guides I60, (Figs. 3 and 5) are drop-bars I6I, having crossopenings I 62, into which the ends of sustaining bars I83, pivoted atI64, project. These bars carry anti-friction rollers I65 ingravitational contact with cams I66, keyed to the cam shaft 44 andhaving crowns I61 on the peripheries thereof to alternately hold saidbars in elevated positions, and to release the same, for gravitymovements with their appended dropbars I6I at properly timed intervalsin operative sequential relation with the pressure thrusts.

The drop bars I5I are of novel construction and comprise integral rightangularly disposed arms I68 and I69 (Figs. 3 and 5) having preferablybottom longitudinal dovetail retaining grooves I10 and HI respectivelyin which adjustable bars I12 and I13 are supported, said bars havingdownturned center stops I14 and side stops I15 for locating therespective center and side box blanks A and B in proper lateralpositions to be assembled.

Box cams I16 having properly formed ogee grooves are fixed to rotatewith the cam shaft 44, the grooves being engaged by anti-friction ballrollers I11, swivelled on the tops of upright pins I18, carried on slideblocks I19, movable on guide bars I80, secured in brackets I8I, whichhave guide bearings I82 for loosely engaging the cam shaft 44,journalled in heavy bearings I83 pending from the top wall of the upperbox beam 23 (Figs. 2 and 3).

To the inner walls of the anvil housings, as in Fig. 5, are securedthreaded nuts I84 which engage the upper adjusting screw 29 so that thehousings and the brackets 8I, which are fixed each to its housing by aconnection I85 (Fig. 3) may be adjusted for widths of the center boxblanks, and the box cams I16 having split collars I86 may be adjusted onthe cam shaft for widths of the side box blanks.

The slide blocks I19 have downwardly directed pusher fingers I81, forengaging the outer edges of the side blanks to move them inwardly intocontact with stop or gage rails I88 (Fig. 9) and under the anvil thrustoccurs.

At the start of the upward movement of the presser plate I2I, it firstraises the center sheet A, from the center belts 83 (Fig. 9) and joggersI89, pivoted on the presser housings are actuated by pins I80 on themoving presser plate to center the sheet A, in proper position, afterwhich said sheet is engaged by the yielding rail I88 and both arecarried up for the sealing thrust, after which the presser plates recedeand the finished box blank is drawn backwardly in a horizontal plane bythe ejector rollers 61 and 68 and disposed upon a suitable table or thelike I9I, supported on the back of the machine frame.

The chain connecting the various adjusting screws may have any slacktaken up by adjusting a gear or roller I92, through a slot I93, in oneof the brackets 24 as in Fig. 1. A crank handle I94, Fig. 3, may beemployed for operating the chain 30.

Referring to Figs. 8 and 9 a safety means is disclosed for preventingbreakage when assembling and starting, or in case of mistiming of thepresser and anvil movements and other reasons.

In this construction the stop or gage rail I88, may be provided with twoor more vertical slots I95, and bolts I96, are passed through the anvilplate I49, and through said slots, washers and weak springs I91 areplaced on the extended bolts back of tightening or retaining nuts I98,thus the bolts are fixed and the rails are movable upwardly and stay upby spring friction, after each rise of the presser plate, until saidrails are depressed to the normal position by cams I99 on shaft 44,acting between the sealing operations.

For safety, a pair of bolts 288, extend outwardly through each of therails I88 and through slots 20I, in a trip-plate 262. The bolts 200,have nuts 203 bearing down on heavy springs 204 resting on washers 205having V ribs 206 enter ing V grooves 201. If the cam I 99 would contactthe trip plate while the presser is up, the hard held joint of the riband groove would slide out before damage of parts occurs.

It is thought that the operation of the machine will be apparent withoutfurther description and it is to be understood that the terms andexpressions employed are used as terms of description and not oflimitation, as mechanical equivalents of the features shown may beemployed within the scope of the following claims.

What we claim and desire to secure by Letters Patent is:

1. In a machine for making paper box blanks, the combination with aframe, of magazines for holding the central and side pieces for makingup the box blank structure; means for feeding the pieces from themagazines; rollers for applying lines of adhesive at near the innerunder edges of the side pieces when on the general level of thecenter-piece; belts for conveying all of said side and center piecesforwardly simultaneously; means under the side belts for elevating saidside pieces above the center-piece during the forward movement of thepieces; swinging pieces for centering the center-piece at the sealingstation; means for moving the inner edges of the side pieces intooverlapping positions with the side edges of the center-piece; means forimparting yielding sealing pressure to the overlapped side portions toproduce a sealed I49, just before the sealing veyors for presenting saidpieces at the sealing seam; and means for ejecting the finished blank,thus formed, from the machines.

2. In a machine for making paper box blanks, the combination withparallel spaced supports, of a revoluble shaft having a longitudinalgroove and journalled in said supports; inner sleeves, and outer sleevesall keyed to said shaft, longitudinal rows of ratchet teeth formed onthe outer faces of the inner sleeves, dogs engaging said ratchet teethfor permitting longitudinal adjustment of the outer sleeves along saidshaft, a pulley formed with each of the outer sleeves, in-

her and outer pulleys arranged at opposite sides of said supports andfast with the inner sleeves, glue applying rollers located between theouter pulleys and said supports, gears on the inner ends of the innersleeves, rotary means operated by said gear for feeding glue to the glueapplying rollers, idler pulleys mounted at the forward ends of saidsupports and conveying belts traversing said pulleys.

3. In combination, housings; pressers guided therein; a rotary pulleyshaft journalled in the housings; a glue applying roller fast on thepulley shaft; a grooved roller operating to feed glue to the applyingroller; means for adjusting the space between said rollers; means foroperating the presser in said housings; and an anvil against which thepresser impinges for sealing together pieces of composite box blanks.

4. In a machine for making paper box blanks, parallel spaced housings;presser plates mounted to slide in said housings; a grooved pulley-shaftjournalled in an end of the housings; inner pairs of pulleys andcorresponding conveying belts located at the inner side of each housing;outer pairs of pulleys mounted for rotation and in fixed relation withthe outer sides of said housings; conveying belts traversing the lastnamed pairs of pulleys; grooved rotary means adjustable for applyingdetermined thicknesses of glue lines to the underside of passing piecesof the said box blanks; side pairs of pulleys and corresponding beltsmounted outward of the said outer pairs of pulleys; means for adjustingthe side pairs of pulleys with their belts for conveying side box blanksof various widths or dimensions, and means for driving said pulleyshaft.

5. In a machine for making paper box blanks, a group of pairs ofrelatively fixed parallel conveyors and adjustable outer conveyors, saidconveyors comprising belts having inwardly flared side walls and flatbottoms and tops, and pulleys having grooves of a cross sectionalcontour corresponding to that of the belts and rotary glue applyingdevices fixedly mounted on the hubs of some of said pulleys associatedwith'said conveyors.

6. In a box blank making machine, magazines for holding center and sidebox blanks; presser plates; yielding anvil plates; conveyor belts'operating at either side of each presser plate for conveying box blanksfed from said magazines toward and between the presser and anvil plates;gravity stops for positioning the blanks for the sealing thrust at thesealing station; safety means for preventing rupture of the moving partsin the said sealing thrust; and means for ejecting the progressivelyfinished composite box blanks from the machine.

'7. In a box blank making machine having mag azines for the box blankpieces; presser plates; spring backed anvil plates; means for applyingglue to some of the box blank pieces; belt constation, means forarranging the blanks in proper relation for sealing between the saidplates; means for operating the presser plates for effecting sealedjoints between the box blank pieces; and safety means for preventingrupture of parts in the sealing thrust.

8. In a box blank making machine having magazines from which box blankpieces are fed, upper and lower sealing plates normally separated;conveyor belts for transferring the box blank pieces to and between saidplates; drop bars; cam controlled means for holding said drop bars insuspension and for releasing the same at timed intervals; said drop barshaving right angularly disposed arms; adjustable stops on said arms forlimiting the conveying movement of center and side pieces of the boxblank to accurately place the pieces to be sealed between the saidsealing plates and means for effecting the sealing of said box blankpieces.

9. In a box blank making machine, anvil plates and presser platesarranged in approximate vertical alignment; said anvil plates eachcomprising a' U shaped structure integrally formed with end guideextensions, a foot flange, circular spring seats; enclosed springsresting centrally on said seats and on the set on the median of theplane of said plates to confine sealing thrusts from the presser platesto the said median.

10. In a machine for making paper box blanks, two pair of spacedhousings, means for adjusting the space between each-pair; anvilsslidable in one pair of housings; pressers slidable in the other pairand yielding elements disposed on the medial line of the plane of saidanvils and within their housings, to compensate for unequal thrusts ofthe pressers in a sealing operation and safety means for preventingrupture of the moving parts when the sealing thrusts occur.

11. In a machine for making paper box blanks having magazines from whichside and center box blank pieces are advanced; pressers; anvils formedwith projecting seats for springs disposed above said pressers and inoperative alignment 1;

therewith; means for advancing the box blanks to the sealing stationwith the side pieces above the plane of the center pieces; and springsresting on said seats located in coactive relation with said anvils andcentrally of the planes thereof, for compensating unequal sealingthrusts of the pressers for producing uniform sealed joints between theblank pieces.

12. In a machine for making paper box blanks, housings comprisingopposite plates; anvil plates slidable between said'plates, the innerplate of said housing having openings; the outer or opposite platehaving semi-circular depressions for forming halves of spring chambers;semi-circular cap plates bolted over the said openings for forming theother halves of spring chambers; springs in said chambers disposed onthe plane lines of the anvil plates and safety means on each anvilhousing for preventing rupture of parts when sealing thrusts areinitiated against said anvil.

13. In a machine for making paper box blanks, anvils, housings in whichthey operate; gage bars-held for limited vertical movements on saidanvils; yielding frictional means for holding the bars where put; a tripplate having slots and V grooves at the sides thereof; bolts extendingthrough said slots from said bars; washers having V ribs disposed insaidgrooves; nuts on said bolts and heavy springs interposed between thesaid nuts and washers; and a cam for restoring the gage bars after theanvils receive a sealing impact from a presser member.

14. In a machine for making paper box blanks, in combination, a frame;anvil housings pending from the top of said frame spring held; safetymeans on said housings; gravity stops suspended on said housings; anvilsmovable in said housings; and springs located in the planes of saidanvils for effecting individual compensation at opposite sides of thesealing mechanism in the sealing thrusts.

15. In a machine for making paper box blanks,

presser plates; anvil plates above the presser plates and in verticalalignment therewith, said anvil plates having integral horizontal seatsdisposed on the medial plane of said plates; springs resting on saidseats to eliminate side strains or stresses in the sealing impacts ofthe presser plates against said anvils and yieldingly interlockedmembers forming snap-joints to prevent rupture of the moving parts whenthe timing of the sealing members fails.

CARL EISENLOHR. BARBARA HREN,

Executria: of the Estate, Joseph Hren, Deceased.

CERTIFICATE OF CORRECTION.

November 26, 193i Patent No. 2,022,371.

CARL EISENLOHR, ET AL.

It is hereby certified that the name of the second named inventor andhis executrix in the signature to the drawings in the above numberedpatent Were erreneousiy written and printed as "Joseph Hero" and"Barbara Hem" respect= v iveiy, whereas said names should have beenwritten and printed as Joseph Hren and Barbara Hren; and that the saidLetters Patent should be read with this correction therein that the samemay conform to the record of the case in the Patent Office.

Signed and sealed this 14th day of January, A. D. 1936.

Les! i e Eraaee (Seal) Acting Commissioner oi Paten s,

